MINIR4 is a mini extreme WiFi smart switch equipped with ESP32 chip, that turns traditional switches into smart switches, automating lights and electronic devices, and tiny size fits in various mounting boxes, including the smallest EU-type/86 type/120 type mounting box. MINIR4 supports external switch control and easily connects to the momentary switch, door exit switch, SPDT switch, latching switch, and even dry contact sensors. MINIR4 has "detach relay" mode, which means the states of external switches and relay are separated, so operating the external switch button won't affect the relay state. Such as, if you open detach relay" mode, when you turn off the light, your smart light won't be offline, and you still can use App to control smart lights. MINIR4 is a smart switch with the gateway function of eWeLink-Remote.After pairing with MINIR4, MINIR4 can be controlled locally by S-MATE through "eWeLink-Remote" signal, and trigger other smart devices in the smart scene. Super Tiny SizeIts compact size allows it to be installed in various mounting boxes, including the smallest European standard. External Switch ControlEasily connect to the momentary switch, door exit switch, SPDT switch, latching switch, and even dry contact sensors. Detach Relay ModeMINIR4 has detach relay mode, which means the states of external switches and relay are separated, so operating the external switch button wont affect the relay state. eWeLink-Remote ControlMINIR4 is a smart switch with the gateway function of eWeLink-Remote. You can add eWeLink-Remote sub-devices, R5 and S-MATE, after pairing with MINIR4, both R5 and S-MATE can act as remote controllers to control MINIR4 locally through the eWeLink-Remote signal. Safe & ReliableTV, CE, and FCC certifications ensure a safer and more reliable product.